JPS5921446B2 - gas burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to improve a gas burner whose flame hole is cooled by water or air.

A conventional gas burner with cooling flame holes has a structure as shown in FIG.

In FIG. 1, numeral 1 is a mixing tube, which sucks and mixes air using gas momentum, and numeral 2 is a perforated plate that serves as a flame hole.

3 is a cooling pipe which is attached to the perforated plate 2 by furnace brazing or the like and has the effect of cooling the flame hole during combustion by circulating water or air therethrough.

Reference numeral 4 denotes a mixture chamber, the cross section of which has a structure as shown in FIG.

As can be seen in FIG. 2, the cooling pipe is bonded to the perforated plate 2 by brazing.

This bonding is generally performed by furnace brazing, in which the objects to be bonded (pipes and perforated plates) are placed in a furnace and brazed.

Stainless steel is used for gas burners, especially burners used in water heaters, etc., due to its corrosion resistance and heat resistance, so it is necessary to use a special furnace such as a hydrogen furnace or a vacuum furnace to braze stainless steel in a furnace. However, it had the drawbacks of poor mass production and high manufacturing costs.

In addition, if the brazing is incomplete, the temperature of the flame hole may rise during combustion, causing backfire. Therefore, perfect adhesion is required, so it is not suitable for mass production in terms of quality control. It wasn't the way it was.

Furthermore, when the perforated plate and the cooling pipe are made of different materials, the perforated plate and the cooling pipe become deformed due to the difference in coefficient of linear expansion, which requires correction work.

As mentioned above, conventional gas burners with cooling flame holes have disadvantages in processing and are poor in mass production.

The gas burner of the present invention improves this drawback.

A detailed explanation will be given with reference to FIGS. 3 and 4, which are one embodiment of the present invention.

FIG. 3 is a sectional view of the burner. A horseshoe-shaped recess is provided in a part of the perforated plate 2 and the depth thereof is shallower than the diameter of the cooling pipe.The cooling pipe 3 is set in this recess.

The diameter of the cooling pipe is larger than the depth of the recess, so it protrudes from the top surface of the perforated plate, but if this part is pressed using an appropriate method to deform the cross section of the pipe, the cross section will match the recess, and the perforated plate and cooling pipe will be removed. is in close contact.

Thereafter, in order to prevent the cooling pipe from falling off from the four parts, it is fixed with the stoppers 1 as shown in FIG.

As described above, by placing the pipe in close contact with the concave part of the perforated plate, it is possible to achieve the same cooling effect as before in the flame hole area, and special and expensive processing methods such as furnace brazing are used for processing. The perforated plate and the cooling pipe can be brought into close contact with each other by a very common and inexpensive processing method.

FIG. 5 shows another embodiment of the invention.

8 in Figure 5 is a soft material such as an annealed copper plate, which acts as a kind of sealing material and enters the gap between the cooling pipe and the perforated plate when the cooling pipe is suppressed, further increasing the adhesion effect between the perforated plate and the cooling pipe. It is.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional gas burner having a cooling pipe, Fig. 2 is a cross-sectional view of Fig. 1, and Figs. Fig. 5 is a cross-sectional view of a gas burner in another embodiment. 1... Mixing pipe, 2... Perforated plate, 3...
...Cooling pipe, 4...Mixture chamber, 5...
... Brazing material, 6 ... recess, 7 ...
Clasp, 8...Metal plate.

Claims (1)

[Scope of Claims] 1 A metal plate having a large number of openings is provided with a recess, a metal pipe is buried in the recess, and then the metal pipe is deformed by a pressing force and brought into close contact with the recess of the metal plate. A gas burner characterized by having flame holes. 2. The gas burner according to claim 1, characterized in that a soft metal plate is inserted between the recess of the perforated plate and the cooling pipe.